Electronic device

Abstract

An object is to provide a pixel structure of a display device including a photosensor which prevents changes in an output of the photosensor and a decrease in imaging quality. The display device has a pixel layout structure in which a shielding wire is disposed between an FD and an imaging signal line (a PR line, a TX line, or an SE line) or between the FD and an image-display signal line in order to reduce or eliminate parasitic capacitance between the FD and a signal line for the purpose of suppressing changes in the potential of the FD. An imaging power supply line, image-display power supply line, a GND line, a common line, or the like whose potential is fixed, such as a common potential line, is used as a shielding wire.

What is claimed is: 
     
       1. An electronic device comprising:
 a photodiode; 
 a first transistor; 
 a second transistor; and 
 a third transistor, 
 wherein a first electrode of the photodiode is electrically connected to a first wire, 
 wherein a second electrode of the photodiode is electrically connected to one of a source and a drain of the first transistor, 
 wherein the other of the source and the drain of the first transistor is electrically connected to a gate of the second transistor, 
 wherein one of a source and a drain of the second transistor is electrically connected to a second wire, 
 wherein the other of the source and the drain of the second transistor is electrically connected to one of a source and a drain of the third transistor, 
 wherein the other of the source and the drain of the third transistor is electrically connected to a third wire, 
 wherein a gate of the first transistor is electrically connected to a fourth wire, 
 wherein a gate of the third transistor is electrically connected to a fifth wire, 
 wherein the first wire is electrically connected to a sixth wire, 
 wherein the first wire and the sixth wire cross each other, and 
 wherein the first wire and the fifth wire cross each other. 
 
     
     
       2. The electronic device according to  claim 1 ,
 wherein a node is electrically connected to the other of the source and the drain of the first transistor and the gate of the second transistor, 
 wherein a seventh wire is supplied with a fixed potential, and 
 wherein the seventh wire is between the node and the first wire. 
 
     
     
       3. The electronic device according to  claim 2 , wherein the seventh wire is a power supply line. 
     
     
       4. The electronic device according to  claim 2 , wherein the seventh wire is a GND line. 
     
     
       5. The electronic device according to  claim 2 , wherein the seventh wire is a common potential line. 
     
     
       6. An electronic device comprising:
 a photodiode; 
 a first transistor; 
 a second transistor; and 
 a third transistor, 
 wherein a first electrode of the photodiode is electrically connected to a first wire, 
 wherein a second electrode of the photodiode is electrically connected to one of a source and a drain of the first transistor, 
 wherein the other of the source and the drain of the first transistor is electrically connected to a gate of the second transistor, 
 wherein one of a source and a drain of the second transistor is electrically connected to a second wire, 
 wherein the other of the source and the drain of the second transistor is electrically connected to one of a source and a drain of the third transistor, 
 wherein the other of the source and the drain of the third transistor is electrically connected to a third wire, 
 wherein a gate of the first transistor is electrically connected to a fourth wire, 
 wherein a gate of the third transistor is electrically connected to a fifth wire, 
 wherein the first wire is electrically connected to a sixth wire, 
 wherein a node is electrically connected to the other of the source and the drain of the first transistor and the gate of the second transistor, 
 wherein a seventh wire is supplied with a fixed potential, and 
 wherein the seventh wire is between the node and the first wire. 
 
     
     
       7. The electronic device according to  claim 6 , wherein the seventh wire is a power supply line. 
     
     
       8. The electronic device according to  claim 6 , wherein the seventh wire is a GND line. 
     
     
       9. The electronic device according to  claim 6 , wherein the seventh wire is a common potential line.